Traditional sash windows require periodic maintenance to ensure that they continue to work effectively. Over many years the timber is likely to have been filled, repaired and painted many times. It is important that old sash windows are cared for correctly as they soon fall into disrepair if left for too long.  Call now and we would be delighted to send one of our skilled craftsmen to provide you with a free no-obligation survey and quotation.


This sash window represented a typical example of what we find on a regular basis. Whether or not it is under layers of clean white paint or not, Charnley Sash Windows will always scrape back to wood on all area’s of suspicion.

This window had the following issues completely remedied by Charnley Sash Windows:


  • A sill that was beyond repair – Replaced
  • It rattled in the wind – Remedied
  • Was unbalanced and difficult to operate – Corrected and balanced, lifters introduced
  • Highly exposed to weathering – Sealed & Decorated
  • A Crack in the Glass – Re-Glazed
  • Insecure – New Locks and opening limiters fitted
  • Unsightly – Perfectly finished & professionally Decorated


Sill & Mullion Splice

Usually the reason we are called out in the first instance is because an area of the window is showing signs of decay. Charnley Sash Windows complete quality repairs every day, we know the value of the timber your windows are made of, the likes of which are scarcely available today. With this in mind we do everything possible to retain as much of your original window as possible re-making replacement parts of a window long before suggesting a costly replacement.

Window sill replacements use treated hardwoods and are fitted traditionally and in keeping with the original window design and our traditional splice repairs are completed to a very high standard. We always re-balance windows and replace the cords guaranteeing our work for 5 years *(provided a decoration schedule is maintained).


Putty and glass repairs also contribute to rattles and draughts. Charnley services complete glass replacements, putty repairs, and 90% of our window repairs on-site. We work as we would expect a tradesman in our own home. Using dust-sheets & Leaving working area’s tidy, windows secured every night, and finish by hoovering anywhere we have been.


Your sash windows were designed to be maintained every 12 – 15 years. These hand crafted windows consist of 15 major parts, all of which can be serviced or replaced if required. Rotten wood can be cut out, affected areas treated and new timber spliced in place. Broken glass can be replaced and a number of security options can be fitted.


Small repairs can be made using the appropriate epoxy or thixotropic resins and finished perfectly in-line with original profiles, leaving seamless repairs every time.

Antique sash windows add greatly to the character of period properties and more often than not, have been in place for 100 years or more. Although they may have inherited draughts and rattles over the years, we are now able to apply modern weather-pile techniques to prevent this. By installing our 10-point draught proofing system your windows and doors will benefit from:



  • Elimination of draughts
  • Reduced heat loss
  • External Noise reduction
  • No more window rattles
  • Improved window operation


The restoration of a sash window varies from case to case. Typically those on the south face of the property are worst affected due to the nature and direction of the weathering. Our comprehensive restoration methods ensure that every part of the window is serviced. Your windows will work perfectly and look fantastic.


A strict check list is followed on every window we work on to ensure that we achieve the best results possible again and again.  Contact Charnley Sash Windows now for a free no-obligation quotation and survey and find out what we can do for you and your home today.




Our complete process involves the following:

  • Preparation. Protective sheeting & a clear work area
  • Stripping of the window
    • Staff bead is carefully removed (paint scored)
    • Lower Sash Removed
    • Parting bead released
    • Upper sash removed
  • Restoring the Sashes
    • Paint build up removed
    • Draught proofing routed in
    • Failed putty replaced
    • Broken glass repaired
    • Major joints strengthened & closed
    • Previous holes blemishes filled and repaired
    • Sash fully primed & decorated
  • Restoring the weight box & frame
    • Remove any rot back to clean timber
    • Apply wood treatment and epoxy primer
    • Strip back failed paintwork
    • Make minor repairs using epoxy filler
    • Repair any major parts using timber spicing techniques
    • Sash cords & pulleys serviced/replaced as necessary
    • Box & frame fully decorated
    • New security fitted
  • Re-assembling the window
    • Upper sash hung on new cords
    • The new weather-pile/parting bead inserted
    • Lower sash hung on new cords
    • Staff beads replaced with draught proofing installed
  • Finally fit the Locks, Lifter & Sash Stop Limiters

Security & Furniture

Perhaps one of the most important aspects of traditional windows is that they were not designed to withstand today’s world, original fixings are often not strong enough any more, and we often see windows that leave properties vulnerable. Charnley Sash Windows have also been called back to a customers home to tidy up where the thieves could not get past our security installations. In this instance we had installed security toughened glass, Brighton fastener locks, and lifting restrictors as a secondary means of security. You can never 100% secure your home, but there is a lot we can do.

Charnley Sash Windows use high quality locks and fittings, these not only provide higher levels of security, but also act as a clear and visible deterrent to the opportunist. We can also install much tougher glass, even 6mm laminated security glass, but more often than not customers benefit from our discounted security and convenience pack. This not only includes a high quality brighton sprung fastener, but also matching sash restrictors (removable stops), and lifting handles. All available in different variations and finishes to match your home. These not only add security and a deterrent to thieves, but also leave the window visually complete internally and as they were designed to be seen.

Security Options

Charnley Sash Window Security Pack.

This includes 1 x Brighton Fastener, 2 x Lifter hooks (bottom window), 2 x Sash Restrictor Bolts. This makes a good comprehensive security package for any sash window, with the added security of child friendly removable restrictors that limit the travel of both the upper and lower sash over a shared opening distance.

Sash Locks

High quality solid fixings a large range of styles is available. Our most common lock is the Brighton Fastener, spring loaded its easy to check at a glance if a locks un-secured as they stand up. When locked they pull the meeting rails together complimenting our 10-point Draught-Proofing system, whilst ensuring a secure and tamper-proof window from the exterior.

Lifting Hooks & Handles

Fitted to the bottom rail of your lower sash internally, lifters serve as an easy and safe way to operate your windows. They also have the added benefit of reducing the stresses and strains that can often damage windows during opening and closing using component parts of the window. These are also available as matching D-handles to be attached to the underside of the upper window externally. With the added bonus of making your windows look smarter and keeping hands away from clean glass and paint finishes making these a popular choice.

Sash Restrictors

We fit restrictors discretely up the sides of the upper sash internally. Our customers are motivated by a number of incentives to fit these. First and foremost is to allow a sash window to be left part open for ventilation without compromising on security. Another aspect is that when windows are shut and locked these restrictors form another layer of security if the window has been forced. Sash Restrictors also make a window secure from the inside should you wish to limit the movement for safety reasons such as a 1st Storey childs room. All our restrictors are carefully fitted and come with a pair of basic removal keys per window.

Window Replacements

We supply and fit replacement windows. Sometimes we discover that a window is beyond economic repair and replacement is the only choice. Maybe you are looking for a perfect match in your new extension? Whatever the case our replacement windows will always be made as an exact copy (or improvement) of the original, and made to the highest standard, we are so confident of this we include a 5 year guarantee against materials and labour. Our skilled craftsmen work to the highest standard and can achieve any style or look you wish to achieve. Call or email your requirements for a free no obligation quotation and survey.

Glass Replacement

The original glass in sash windows can be beautiful & often antique, but unfortunately it is thin and weak. Over time cracks or breaks occur and it is important that the correct glass replacement is made. Often our customers have been advised by conservation officers, and we are capable of satisfying all heritage and conservation legislation. We are so confident in our glass replacements that again we extent our 5 year guarantee against materials and labour to this services, and any subsequent cracks found through normal operation will be repaired free of charge on any glass we replace.  We are able to supply & fit the following types and styles on request:

  • Salvaged original glass (subject to availability)
  • Horticultural glass (3mm thick with light imperfections)
  • Regular 4mm modern float glass (typical choice)
  • Toughened 4mm modern float glass (high security & safety glass)
  • Laminated 6mm safety glass (high security & safety glass / acoustic glass)
  • Slimlite double glazed units (as small as 10mm thick)
  • Standard double glazed units (DGU)
  • Pilkington obscured & patterned glass (regular & toughened options)

There is a wide variety of glazing options available for sash windows but there are points to consider. With vertical sliding sash windows, we often find that the replacement glass is thicker than the original and as such the window becomes heavier than the weights designed to balance it. In most cases we can add lead weights to compensate.

Double Glazing is available in slim versions, we try to advise that this can be quite a costly route and we often get asked about incorporating it into traditional windows. Typically we do not modify existing sashes to accommodate slim DGU’s (double glazed units) This is for a number of reasons, most importantly, the sash was not designed to carry the extra weight. In such cases we have new sashes made that incorporate slim double glazing. Due to the weight increases it becomes vital to review how the balance is achieved. In some cases we can replace weights with lead instead of cast iron and use the traditional weight & pulley system. Sometimes the window will have to be fitted with the ‘less-traditional’ option of spring balances instead.

Window Maintenance

In order to maintain good working windows it is important to check them periodically. If a potential problem is spotted early enough a simple preventative repair will be all that is required. If left, small areas of rot can consume entire parts of the window ending in a more costly repair or sometimes even replacement. We are able to survey your windows and provide recommendations to keep them in good order free of charge. Our general maintenance services include:

  • Sash Cord Replacement
  • Localised Rot Treatment
  • Putty Replacement
  • Glass Replacement
  • Security Upgrades
  • Modern Sash Balance Spring System
  • General Health Check

About Sash Windows

Sash windows are commonly found in Georgian, Victorian and Edwardian buildings. They have been available since the 1600’s and come in a wide variety of shapes and sizes. Some are highly ornate whilst other are simply functional. The sash window consists of an upper and lower sash that run vertically or occasionally horizontally within a timber box. Commonly they are balanced using weights that are housed within the box either side of the windows. Cords attach the counter-weights via the pulleys to match the weight of the window in order to enable a lift & close operation.

Sash windows offer great air circulation and have significant advantages in warmer weather as by opening the upper and lower by the same amount allows the hot or stale air to escape at ceiling level, replaced by cooler fresh air entering at the lower.

These windows do require periodic maintenance to ensure that they continue to work effectively. Over many years the timber is likely to have been filled, repaired and painted many times. It is important that old sash windows are cared for correctly as they soon fall into disrepair if left to look after themselves!

Removing an antique window from a property can have serious implications on its character and hence detract from its overall value. Sometimes this is overlooked due to the fact that older windows require maintenance and painting, seen as an inconvenience. Our draught-proofing services for windows and doors offer a significant increase in efficiency in the home and ultimately reduce our carbon footprint by making better use of heating systems and reducing our annual fuel usage and importantly heating bills.

Often we feel that full window replacements are not the best way forward. There are a number of reasons for this. The main driver for most customers is the cost of replacement far outweighs that of a repair. At the point of full finish our window renovations can be between ⅓ and ½ of the cost of a full replacement taking into account associated plastering work and decorating that will be required. The next point is that your original sash windows are very often made of pitch pine, the likes of which is just not available any more, newer timber windows are likely to have a shorter life cycle than the traditional hand crafted ones of 100 + years ago, requiring more maintenance in the years ahead. With this in mind we always try and replace component parts of windows where required rather than take the ‘easy-route’ and just install new windows.

Plastic (UPVC) windows with double glazing is now recognised as an unsustainable option by comparison. They are unlikely to save the money they cost to install due to the environmental impact of both construction and disposal of what is essentially a toxic material. A life cycle that is far reduced by changing trends, hinges and fittings wearing out or breaking, or double glazed units failing and misting over.